Reversing-gear for internal-combustion engines.



J. ROMBYN. REVERSING GEAR FOR INTERNAL GOMBUSTION ENGINES. APIfLIUAT IONFILED SEPT. 2, 1913.

1 95,421 Patented May 5, 1914.

wiZmeJJ'e COLUMBIA PLAND'GRAPH 60.. WASHINGTON, D. c.

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JEAN ROMEYN, 0F BRUSSELS, BELGIUM.

REVERSING-GEAR FOR INTERNAL-COMBUSTION ENGIN ES.

Specification of Letters Patent.

Application filed. September 2, 1913.

Patented May 5, 1914. Serial No. 787,662.

To all whom it may concern:

Be it known that I, JEAN ROMEYN, engineer, a subject of the King ofBelgium, and residing at (56 Avenue Jean Volders, Brussels, Belgium,have invented certain new and useful Improvements in Reversing- Gearsfor Internal-Combustion Engines; and I do hereby declare the followingto be a full, clear, and exact description of the invention, such aswill enable others skilled in the art to which it appertains to make anduse the same, reference being had to the accompanying drawings, and toletters or figures of reference marked thereon, which form a part ofthis specification.

This invention relates to an improved reversing gear for internalcombustion engines of the type adapted to be changeably worked.

by means of air and fuel.

It is well known that with internal combustion engines having lightfiy-wheels and adapted to be changeably worked by means of air and fuelthere is, when changing from working with air to working with fuel,danger of an untimely stoppage of the engine due to spark failures,often produced at the first few revolutions and, to avoid this it isusual to divide the cylinders of the engine into two or more-groups inwhich the transition from working with air to working with fuel iseffected at different times, this change being usually made, as is oftendone in the case of stationary engines, by shifting the point ofsuspension of the control levers gear by means of an eccentric. To allowthe engine to revolve in either the one or the other direction it isusual to provide the cam shaftwith two sets of cams one for ahead theother for reverse, and by longitudinally shifting the cam shaft eitherthe one or the other set of cams is brought into engagement with thelevers and simultaneously the other set becomes inactive.

The object of the present invention is to provide a simple and efiicientgear by means of which all the eccent-ricscarrying the levers for allthe cylinders of all the groups can be operated in essentially anydesired sequence. For this purpose two or more cranks are keyed on thesame shaft, and each drives a special lever for each group of cylinders,a connecting rod being jointed to each crank and a further connectingrod being jointed to each lever said connecting 13, are adapted forcontrol ahead rods being pivotally connected together and guided at thepoint of junction by a link motion in a manner that the lever remainsmotionless during a part of the stroke of the crank.

In order that this invention may be clearly understood I have hereuntoappended an explanatory sheet of drawings, wherein for the sake ofclearness the device is shown as applied to an internal combustionengine having its cylinders divided into two groups each group"containing but one cylinder, these cylinders being represented by I andII. p

Figure 1 represents a longitudinal elevation of the valve gear. Fig. 2is a section on the line A, A of Fig. 1 in the direction of the arrowB.- Fig. 3 is a section on the line A, A, of Fig. 1 in the direction ofthe arrow C. v

The cam shaft, 7 carried-by the bearings, 8, is common to all thecylinders of the motor and the shaft, 9, supporting the distributinglevers and carried by the bearings, 10 is common to all the cylinders ofthe group I, while the shaft 9, analogous to the shaft, 9, is common toallthe cylinders of group II. The shaft, 7, carries, for each cylinderof group I cams, 11, 12, 13, 14:,and for each cylinder of group II cams,12, 11', 14, 13, the cams, 11, 11, being adapted for control ahead onair, and the cams, 12, 12', for control reverse on air, while the cams,13, on fuel and the cams, 14:, 14, for control reverse on fuel. Theshaft, 7, may be shifted longitudinally by means of a lever, 15, and maybe locked in either of two positions by means of the usual lockingdevice, 16, adapted'to engage with either of two notches, 17 and 18.

19 represents the gear for actuating the shaft, 7.

The shaft, 9 carries, for each cylinder of the group I, an eccentric,20, serving to support both a lever 21, intended to depress the rod 22of the air valve, and a lever, 23, intended to lift the injection pin,24, and'the shaft, 9, carries for each cylinder of the group II aneccentric, 20, shown in clottedlines Fig. 1 serving to support both alever, 21, intended to depress the air valve, and a lever, 23, intendedto lift'the injection pin. lVhen the eccentrics, 20, 20 are set alongthe line a, a, respectively, the rollers of the levers, 21., 21, and 23,20, are sufliciently distant from the cams to avoid contacting with thesame. If however, the eccentrics are turned to set along the lines, Z),5, r c, c the levers 21, 21 or 23, 23, respectively come in contact withthe path of travel of the corresponding cams according to thelongitudinal position of the shaft, 7.

The cams are arranged in such a manner that, when the locking device 16is in engagement with the notch 17, either the cams 11 and 11, for aheadon air operate the levers 21 and 21, or the cams 13 and 13, for

. ahead on fuel operate the levers 23 and 23,

according as the eccentrics 20 and 20 are set along the lines 6, b, oralong the lines o, c. On the other hand, when the locking device 16 isin engagement with the notch 18, the cams, 12, 12', for reverse on airor the cams i l, 14 for reverse on fuel are brought into action.

The arrangements described above comprising the cam shaft with doubleset of cams, and levers carried by eccentrics, are well known.

The present invention relates to the device described hereafter andwhich is intended to control the combined workings of the shafts, 9 and9. A shaft 28 carried in bearings 27 has mounted thereon two cranks, 29,29, and a worm wheel 25, and is adapted to be rotated by means of aworm, 26, engaging said worm wheel. The free ends to the cranks, 29, 29,are connected to rods, 31, 31, which are pivotally connected withconnecting rods, 32, 32, which latter are also connected with thelevers, 30, 30. The pivot joints connecting the rods 31 and 32 and 32and 32 are adapted to move in suitably shaped slots in fixed guides 34and 34. i

Let a, a, b, b, 0, c, be the center lines for the positions of thelevers 30, 30, when set to start to work with air, and to work with fuelrespectively, and let R be the length, from center to center, of theconnecting rods 32, and 32, and a a points in the slots of the guides34L, 34:, respectively situated at a distance It from the points a a,.

The circle described by the extremity of the crank 29 is divided into 6equal parts in such manner that two points of division, 5 and 2, thecenter of the shaft 28 and the point a fall on the same straight line.The length of the rod 31, is such that the roller 33 occupies theposition a when the crank pin is found at the point 06. It will beobserved that the roller will return to the same point (4 when the pinof the crank assumes the position 4. At the end nearest the shaft, 28,the slot in the guide 34, causes the roller 33 to move along an arc of acircle 0 traced with 0,, as center and R as radius, while at the otherend, it causes the roller 33 to move along the arc of a circle 5 tracedwith 6,, as

center and R as radius. The lengths of two portions of the slotcoinciding respectively with the arcs of the circles 0 and b are suchthat the end of the lever 30 is brought into 5,, while the crank pintraverses the are 1., 2, 3, and it is brought into 0,, when the crankpin is found in 5. It is to be observed that, in the positions 3, 1., 2and the gear is non-reversible. The circle described by the extremity ofthe crank 29', is divided into 6 equal parts so that two points ofdivision 1., and. t, the center of the shaft 28 and the point (4,. fallin the same straight line. The length of the rod 31', is such that theroller 33 occupies the position a,, when the crank m1 is found in 0-6.It will be observed that the roller 33 will return to the same point. a,when the crank pin assumes the position 2. At the end nearest the shaft28, the slot in the guide 34: causes the roller 33 to move along the arcof a circle a, traced with c, as center and R as radius, while at theother end, it causes the roller 33 to move along the are of circle 6,traced with Z), as center and R as radius. The lengths of the twoportions of the slot 34 coinciding re spectively with the arcs of thecircles 0' and I), are such that the extremity of the lever 30 isbrought back into Z), when the crank pin is found in I, while it ismaintained in a, during the time that the crank pin traverses the are 3--4: -5 It is to be observed that in the positions 1 3 4E and 5, thegear is non-reversible.

The internal combustion engine comprising essentially the previouslydescribed parts is erected with the cranks 29 and 29' set the one withregard to the other so that the crank 29 is found in 06 when the crank29 is found in 06', and in a manner that in this position, all thelevers are remote from the cams.

The shaft 7 may be shifted at will by means of the lever 15 in order toreverse. If, starting from the position 06--0-6, the shaft 28 is turnedin the direction of the arrow, the effect is in the position 1-1: thestarting with air of all the cylinders; in the position 2-2: thestarting with air by means of the group I and the inaction of the groupH; in the position 3-3: the starting with air by means of the group Iand the working with fuel in the cylinders of the group H; in theposition Mr the inaction of the group I and the working with fuel in thecylinders of the group II; in the position 5-5: the working with fuel inall the cylinders.

To stop the machine it is suflicient to continue the rotation in thesame direction in order to come back to the position 0-6- 06. A similareffect, only with engine reversed, can be obtained by moving the shaftlongitudinally toward the right.

Of course if desired it can be arranged,

without departing from the spirit of my invention, to efiect the changein essentially any other desired sequence.

Claims:

1. In a reversing gear for internal combustion engines, the combinationwith two or more groups of cylinders adapted to be worked alternately bygas and air and an operating lever for each group of cylinders, of acrank for each group, articulated rods connecting the cranks andoperating levers, and means to so guide the connecting rods at theirpoint of connection that the operating levers remain motionless during apor tion of the stroke of the cranks.

2. In a reversing gear for internal combustion engines, the combinationwith two or more groups of cylinders adapted to be worked alternately bygas and air, and a separate operating lever for each group of cylinders,of a shaft, two or more cranks keyed on said shaft, pivotally connectedrods connecting the levers to the cranks, and

guides for the pivots of said rods adapted to render the leversmotionless during a portion or the stroke of each crank.

3. In a reversing gear for internal combustion engines, the combinationwith two or more groups of cylinders adapted to be worked alternately bygas or air, and a separate operating lever for each group of cylinders,of a shaft, two cranks keyed on the latter, a connecting rod jointed toeach crank, a connecting rod jointed to each lever, a pivot connectingeach pair of rods, fixed guides having a slot therein to receive thepivots and arranged to render the levers motionless during a portion ofthe stroke of each crank.

In testimony that I claim the foregoing as my invention, I have signedmy name in presence of two subscribing witnesses.

J EAN ROMEYN.

Witnesses:

FELIX Dn COsMAN, JosErH CUTERs.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

